Curve very sharp after converting from mesh
This is because the converted curve is a Poly spline.
To convert it to a smoothly interpolated curve:

Convert it to a Bezier or NURBS spline in 3D view &gt; Tool shelf &gt; Curve Tools &gt; Set Spline Type:


Then convert all the Control Vertices to Auto (or something besides vector) by pressing A&gt; Select all V&gt; Automatic.


Now you can adjust the Resolution as desired to adjust the &quot;smoothness&quot;: